Code/net/minecraft/network/chat/MessageSignature.java

package net.minecraft.network.chat;

import com.google.common.base.Preconditions;
import com.mojang.serialization.Codec;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Base64;
import java.util.Optional;
import javax.annotation.Nullable;
import net.minecraft.network.FriendlyByteBuf;
import net.minecraft.util.ExtraCodecs;
import net.minecraft.util.SignatureUpdater;
import net.minecraft.util.SignatureValidator;

public record MessageSignature(byte[] bytes) {
    public static final Codec<MessageSignature> CODEC = ExtraCodecs.BASE64_STRING.xmap(MessageSignature::new, MessageSignature::bytes);
    public static final int BYTES = 256;

    public MessageSignature(byte[] bytes) {
        Preconditions.checkState(bytes.length == 256, "Invalid message signature size");
        this.bytes = bytes;
    }

    public static MessageSignature read(FriendlyByteBuf p_249837_) {
        byte[] abyte = new byte[256];
        p_249837_.readBytes(abyte);
        return new MessageSignature(abyte);
    }

    public static void write(FriendlyByteBuf p_250642_, MessageSignature p_249714_) {
        p_250642_.writeBytes(p_249714_.bytes);
    }

    public boolean verify(SignatureValidator p_250998_, SignatureUpdater p_249843_) {
        return p_250998_.validate(p_249843_, this.bytes);
    }

    public ByteBuffer asByteBuffer() {
        return ByteBuffer.wrap(this.bytes);
    }

    @Override
    public boolean equals(Object p_237166_) {
        return this == p_237166_ || p_237166_ instanceof MessageSignature messagesignature && Arrays.equals(this.bytes, messagesignature.bytes);
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(this.bytes);
    }

    @Override
    public String toString() {
        return Base64.getEncoder().encodeToString(this.bytes);
    }

    public static String describe(@Nullable MessageSignature p_395986_) {
        return p_395986_ == null ? "<no signature>" : p_395986_.toString();
    }

    public MessageSignature.Packed pack(MessageSignatureCache p_253845_) {
        int i = p_253845_.pack(this);
        return i != -1 ? new MessageSignature.Packed(i) : new MessageSignature.Packed(this);
    }

    public int checksum() {
        return Arrays.hashCode(this.bytes);
    }

    public record Packed(int id, @Nullable MessageSignature fullSignature) {
        public static final int FULL_SIGNATURE = -1;

        public Packed(MessageSignature p_249705_) {
            this(-1, p_249705_);
        }

        public Packed(int p_250015_) {
            this(p_250015_, null);
        }

        public static MessageSignature.Packed read(FriendlyByteBuf p_250810_) {
            int i = p_250810_.readVarInt() - 1;
            return i == -1 ? new MessageSignature.Packed(MessageSignature.read(p_250810_)) : new MessageSignature.Packed(i);
        }

        public static void write(FriendlyByteBuf p_251691_, MessageSignature.Packed p_252193_) {
            p_251691_.writeVarInt(p_252193_.id() + 1);
            if (p_252193_.fullSignature() != null) {
                MessageSignature.write(p_251691_, p_252193_.fullSignature());
            }
        }

        public Optional<MessageSignature> unpack(MessageSignatureCache p_254423_) {
            return this.fullSignature != null ? Optional.of(this.fullSignature) : Optional.ofNullable(p_254423_.unpack(this.id));
        }
    }
}